Glass fiber wool felt

Abstract

The application discloses a glass fiber cotton felt, and relates to the technical field of thermal and sound insulation materials. The glass fiber cotton felt is obtained by spraying an adhesive on glass fibers, curing and drying. A modified phenolic resin solution is obtained by the following steps: adding 200-300 parts by weight of formaldehyde to 100 parts by weight of a mixed solution composed of phenol, dimethyl phenol and lignin, and reacting at a temperature of 40-60 DEG C to obtain a first solution, wherein the weight ratio of the phenol, dimethyl phenol and lignin is 10:2-4:1-8. An organic silicon modified methyl methacrylate prepolymer solution is obtained by the following steps: adding 100-200 parts by weight of methyl methacrylate to 100 parts by weight of a mixed solution composed of a silicon source and an organic solvent, uniformly stirring, and then adding deionized water and an initiator. The glass fiber cotton felt of the application has excellent hydrophobic performance, and the hydrophobic rate of the glass fiber cotton felt reaches 99% while the resilience of the glass fiber cotton felt is maintained.

Description

Technical Field

[0001] This invention relates to the field of heat insulation and sound insulation, and more particularly to a glass fiber cotton felt. Background Technology

[0002] Commercial aircraft employ a sound-insulating and insulating sealed bag between the cabin interior trim and the fuselage skin. This material provides heat insulation, sound insulation, flame retardancy, and electrical insulation. The aircraft interior sealing bag is manufactured by filling a thin film bag with fiberglass mat and then ultrasonically heat-sealing the bag. Existing heat and sound insulation modules are susceptible to moisture over time, affecting their performance and requiring further improvement. Summary of the Invention

[0003] The purpose of this invention is to provide a glass fiber felt that, while maintaining the resilience of glass fiber felt, improves the water-repellent properties of the heat insulation and sound insulation module, enabling the glass fiber felt to reach a contact angle of 143° and a water repellency rate of 99%, demonstrating excellent water repellency performance that meets the requirements of commercial large aircraft.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a glass fiber cotton felt, wherein the heat-insulating and sound-insulating cotton felt is formed by curing and drying glass fibers sprayed with adhesive, and the adhesive is composed of the following components in parts by weight: 100 parts modified phenolic resin solution, 38 parts organosilicon modified methyl methacrylate prepolymer, 350 parts water, 10 parts pentaerythritol, 3 parts methyl emulsified silicone oil, and 10 parts dioctyl phthalate;

[0005] The modified phenolic resin solution is obtained through the following steps:

[0006] Step 1: Add 200-300 parts by weight of formaldehyde to 100 parts by weight of a mixture of phenol, xylenol and lignin, and react at a temperature of 40-60°C to obtain a first solution. The weight ratio of phenol, xylenol and lignin is 10:2-4:1-8.

[0007] Step 2: Add 5-15 parts by weight of sodium hydroxide aqueous solution to the first solution to adjust the pH value of the first solution to 8-9, heat to 75-85℃ and keep warm for 1-2 hours, then cool down to 35-50℃, add 4-8 parts by weight of sulfuric acid and stir to obtain the second solution.

[0008] Step 3: Add 20-40 parts of hexamethylolmelamine to the second solution in batches to obtain the modified phenolic resin solution;

[0009] The organosilicon-modified methyl methacrylate prepolymer is obtained through the following steps: 100-200 parts by weight of methyl methacrylate are added to 100 parts by weight of a mixture composed of a silicon source and an organic solvent, and after stirring evenly, deionized water and an initiator are added.

[0010] The following is a further improvement to the above technical solution:

[0011] 1. In the above scheme, the coupling agent is selected from KH550, KH560, KH570 or KH792.

[0012] 2. In the above scheme, in step 3 of the modified phenolic resin solution, 20 to 40 parts of hexamethylol melamine are added to the second solution in at least three batches and stirred.

[0013] 3. In the above scheme, the silicon source is composed of a mixture of tetraethyl orthosilicate and a silane coupling agent, wherein the weight ratio of the tetraethyl orthosilicate to the silane coupling agent is 1 to 3:1.

[0014] 4. In the above scheme, the organic solvent is at least one of N,N-dimethylformamide, ethanol, methanol, and toluene.

[0015] 5. In the above scheme, the initiator is azobisisobutyronitrile.

[0016] 6. In the above scheme, the mass ratio of methyl methacrylate, deionized water and initiator is 10:0.5~2:0.5~2.

[0017] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0018] 1. The present invention relates to a glass fiber felt, wherein the surface of the glass fiber felt is sprayed with an adhesive. This adhesive is a composite adhesive, which includes lignin and a phenolic resin solution modified with hexamethylol melamine and an organosilicon-modified methyl methacrylate prepolymer. While maintaining the resilience of the glass fiber felt, it improves the water repellency of the heat insulation and sound insulation module, so that the contact angle of the glass fiber felt reaches 143° and the water repellency rate of the glass fiber felt reaches 99%. The water repellency performance is excellent and meets the indicators of commercial large aircraft.

[0019] 2. The glass fiber felt of the present invention contains an organosilicon-modified methyl methacrylate prepolymer added to its adhesive. This prepolymer has low surface energy, dustproof properties, and resistance to high and low temperatures. It is also very soft. It is used in glass fiber adhesives to make glass fiber felt from loose ultrafine glass fibers. The adhesives used in this process require the aforementioned properties of organosilicon, including resistance to high and low temperatures (aircraft require a range of -60°C to +80°C) and low surface energy for dustproofing. Detailed Implementation

[0020] The present patent can be further understood through the specific embodiments given below, but they are not intended to limit the present patent.

[0021] The present invention will be further described below with reference to embodiments:

[0022] Example: A glass fiber cotton felt, wherein the heat insulation and sound insulation cotton felt is formed by curing and drying glass fibers sprayed with adhesive, wherein the adhesive is composed of the following components in parts by weight: 100 parts modified phenolic resin solution, 38 parts organosilicon modified methyl methacrylate prepolymer, 350 parts water, 10 parts pentaerythritol, 3 parts methyl emulsified silicone oil, and 10 parts dioctyl phthalate;

[0023] The modified phenolic resin solution is obtained through the following steps:

[0024] Step 1: Add formaldehyde to a mixture of phenol, xylenol and lignin, and react at a temperature of 40-60°C to obtain a first solution. The weight ratio of phenol, xylenol and lignin is 10:2-4:1-8.

[0025] Step 2: Add sodium hydroxide aqueous solution to the first solution to adjust the pH value of the first solution to 8-9, heat to 75-85℃ and keep at this temperature for 1-2 hours, then cool to 35-50℃, add sulfuric acid and stir to obtain the second solution;

[0026] Step 3: Add hexamethylol melamine to the second solution in three equal batches to obtain the modified phenolic resin solution;

[0027] The modified phenolic resin solution is composed of the following components in parts by weight: 82 parts phenol, 18 parts xylenol, 15 parts lignin, 200 parts formaldehyde, 10 parts sodium hydroxide, 5 parts sulfuric acid, and 25 parts hexamethylolmelamine.

[0028] The adhesive is formed by mixing and stirring a modified phenolic resin solution, an organosilicon-modified methyl methacrylate prepolymer, water, pentaerythritol, methyl emulsified silicone oil, and dioctyl phthalate.

[0029] The organosilicon-modified methyl methacrylate prepolymer solution is obtained through the following steps: 150 parts by weight of methyl methacrylate are added to 100 parts by weight of a mixture composed of a silicon source and an organic solvent. After stirring evenly, deionized water and an initiator are added to obtain the organosilicon-modified methyl methacrylate prepolymer solution, which is composed of the following components by weight: 25 parts of tetraethyl orthosilicate, 15 parts of silane coupling agent, 60 parts of organic solvent, 120 parts of methyl methacrylate, 10 parts of deionized water, and 10 parts of azobisisobutyronitrile.

[0030] The adhesive is formed by mixing and stirring a modified phenolic resin solution, an organosilicon-modified methyl methacrylate prepolymer, water, pentaerythritol, methyl emulsified silicone oil, and dioctyl phthalate.

[0031] Comparative Examples 1-3: A heat-insulating and sound-insulating module, which is made by curing and drying glass fiber coated with adhesive; the adhesive is composed of the following components in parts by weight, as shown in Table 1:

[0032] Table 1

[0033]

[0034] The phenolic resin solution is composed of the following components in parts by weight, as shown in Table 2:

[0035] Table 2

[0036] Components Comparative Example 1 Comparative Example 2 Comparative Example 3 phenol 82 copies 82 copies 82 copies Xylenol 18 copies 18 copies 18 copies Lignin - 15 copies 15 copies formaldehyde 200 copies 200 copies 200 copies Sodium hydroxide 10 copies 10 copies 10 copies sulfuric acid 5 copies 5 copies 5 copies Hexahydroxymethyl melamine 25 copies - 25 copies ;

[0037] The preparation process of the phenolic resin solution is the same as in the embodiment.

[0038] The properties of the glass fiber wool felts prepared in Examples 1-4 and Comparative Examples 1-3 are shown in Table 3:

[0039] Table 3

[0040]

[0041] As shown in the evaluation results in Table 3, the phenolic resin solution in Comparative Example 1 lacked lignin, the phenolic resin solution in Comparative Example 2 lacked hexamethylol melamine, and the adhesive in Comparative Example 3 lacked organosilicon-modified methyl methacrylate prepolymer. These results in the glass fiber cotton felt having a lower water repellency than the embodiment of the present invention. The glass fiber cotton felt in the embodiment of the present invention has a contact angle of 143° and a water repellency of 99%, demonstrating excellent water repellency and meeting the requirements for commercial large aircraft.

[0042] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A glass fiber felt, characterized in that: The cotton felt is made by curing and drying glass fibers sprayed with adhesive. The adhesive is composed of the following components in parts by weight: 100 parts modified phenolic resin solution, 38 parts organosilicon modified methyl methacrylate prepolymer, 350 parts water, 10 parts pentaerythritol, 3 parts methyl emulsified silicone oil, and 10 parts dioctyl phthalate. The modified phenolic resin solution is obtained through the following steps: Step 1: Add 200-300 parts by weight of formaldehyde to 100 parts by weight of a mixture of phenol, xylenol and lignin, and react at a temperature of 40-60°C to obtain a first solution. The weight ratio of phenol, xylenol and lignin is 10:2-4:1-8. Step 2: Add 5-15 parts by weight of sodium hydroxide aqueous solution to the first solution to adjust the pH value of the first solution to 8-9, heat to 75-85℃ and keep warm for 1-2 hours, then cool down to 35-50℃, add 4-8 parts by weight of sulfuric acid and stir to obtain the second solution. Step 3: Add 20-40 parts of hexamethylolmelamine to the second solution in batches to obtain the modified phenolic resin solution; The organosilicon-modified methyl methacrylate prepolymer solution is obtained through the following steps: 100-200 parts by weight of methyl methacrylate are added to 100 parts by weight of a mixture composed of a silicon source and an organic solvent, and after stirring evenly, deionized water and an initiator are added. The silicon source is composed of a mixture of tetraethyl orthosilicate and a silane coupling agent, wherein the weight ratio of the tetraethyl orthosilicate to the silane coupling agent is 1 to 3:

1.

2. The glass fiber felt according to claim 1, characterized in that: In step 3 of the modified phenolic resin solution, 20-40 parts of hexamethylol melamine are added to the second solution in at least three batches and stirred.

3. The glass fiber felt according to claim 1, characterized in that: The initiator is azobisisobutyronitrile.

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